This changeset crashes test_io here:

test_close_error_on_close (test.test_io.CBufferedReaderTest) ... python: Objects/abstract.c:2091: PyObject_Call: Assertion `(result != ((void *)0) && !PyErr_Occurred()) || (result == ((void *)0) && PyErr_Occurred())' failed.
Fatal Python error: Aborted

Current thread 0x00007ff1b3264740 (most recent call first):
  File "/home/antoine/cpython/default/Lib/test/test_io.py", line 793 in test_close_error_on_close
  File "/home/antoine/cpython/default/Lib/unittest/case.py", line 577 in run
  File "/home/antoine/cpython/default/Lib/unittest/case.py", line 625 in __call__
  File "/home/antoine/cpython/default/Lib/unittest/suite.py", line 125 in run
  File "/home/antoine/cpython/default/Lib/unittest/suite.py", line 87 in __call__
  File "/home/antoine/cpython/default/Lib/unittest/suite.py", line 125 in run
  File "/home/antoine/cpython/default/Lib/unittest/suite.py", line 87 in __call__
  File "/home/antoine/cpython/default/Lib/unittest/suite.py", line 125 in run
  File "/home/antoine/cpython/default/Lib/unittest/suite.py", line 87 in __call__
  File "/home/antoine/cpython/default/Lib/unittest/runner.py", line 168 in run
  File "/home/antoine/cpython/default/Lib/test/support/__init__.py", line 1724 in _run_suite
  File "/home/antoine/cpython/default/Lib/test/support/__init__.py", line 1758 in run_unittest
  File "/home/antoine/cpython/default/Lib/test/regrtest.py", line 1277 in <lambda>
  File "/home/antoine/cpython/default/Lib/test/regrtest.py", line 1278 in runtest_inner
  File "/home/antoine/cpython/default/Lib/test/regrtest.py", line 978 in runtest
  File "/home/antoine/cpython/default/Lib/test/regrtest.py", line 763 in main
  File "/home/antoine/cpython/default/Lib/test/regrtest.py", line 1562 in main_in_temp_cwd
  File "/home/antoine/cpython/default/Lib/test/__main__.py", line 3 in <module>
  File "/home/antoine/cpython/default/Lib/runpy.py", line 85 in _run_code
  File "/home/antoine/cpython/default/Lib/runpy.py", line 170 in _run_module_as_main
Abandon